​MILTON, a borough of Northumberland county, Pennsylvania, U.S.A., on the Susquehanna river at the mouth of Limestone Run, about 66 m. N. of Harrisburg. Pop. (1890), 5317; (1900), 6175 (166 foreign-born); (1910), 7460. It is served by the Pennsylvania, and the Philadelphia & Reading railways, and is connected with Lewisburg and Watsontown by an electric line. Milton has an attractive public park, is in an agricultural region, and has various manufactures. It was founded in 1792, and incorporated as a borough in 1817. In 1880 it was in great part destroyed by fire.